| 摘要 |
<p>The present invention is to disclose a passive decay heat removal system for a nuclear power plant, capable of stably supplying electricity necessary to operate a shutdown cooling pump. The passive decay heat removal system includes a shutdown cooling pump, a shutdown cooling heat exchanger, a turbine generator, and an external heat exchanger. The shutdown cooling pump is mounted on a nuclear reactor coolant pipeline which circulates a nuclear reactor coolant for cooling a nuclear reactor. The shutdown cooling heat exchanger is mounted between the nuclear reactor and the shutdown cooling pump, for heat exchange between the nuclear reactor coolant and a supercritical pressure fluid circulating through a supercritical pressure fluid pipe line. The turbine generator is connected to the shutdown cooling heat exchanger, generates electricity by the supercritical pressure fluid in a high-temperature gas state passing through the shutdown cooling heat exchanger, and supplies electricity to the shutdown cooling pump. The external heat exchanger is mounted on a supercritical pressure fluid pipeline to cool the supercritical pressure fluid passing through the turbine generator and transfer the supercritical pressure fluid to the shutdown cooling heat exchanger. According to the present invention, even in an abnormal state of a nuclear reactor, for example, in the case of loss of all power, electricity necessary to operate a shutdown cooling pump is continuously generated by a supercritical pressure fluid cycle for cooling a nuclear reactor coolant and is stably supplied, thereby significantly improving the health of the nuclear reactor. In addition, since it is possible to easily minimize the shutdown cooling heat exchanger and the turbine generator by the supercritical pressure fluid cycle, it can be economically installed in existing nuclear power plants as well as new nuclear power plants.</p> |
